FIX: ISNULL with ANSI_WARNINGS OFF Drops Connection On Divide By Zero

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Article ID: 259775 - View products that this article applies to.
This article was previously published under Q259775
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BUG #: 57545 (SQLBUG_70)
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If you use Microsoft SQL Server 7.0 Service Pack 1 or Service Pack 2, and you use ISNULL as an expression that performs a divide by zero while the client has ANSI_WARNINGS set to OFF, the client disconnects. The errors that occur differ slightly depending on whether the client is ODBC, OLE DB or DB-Library-based. The ODBC and DB-Library errors follow.

ODBC Error:
[Microsoft][ODBC SQL Server Driver]Unknown token received from SQL Server
DB-Library Error:
DB-Library: Possible network error: Bad token from SQL Server: Datastream processing out of sync.
Net-Library error 0: (null)
DB-Library: DBPROCESS is dead or not enabled.


Set ANSI_WARNINGS to ON, or change the expression so that it will not encounter a divide by zero error.


Microsoft has confirmed this to be a problem in SQL Server 7.0. This problem has been corrected in U.S. Service Pack 3 for Microsoft SQL Server 7.0. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
274799 INF: How to Obtain Service Pack 3 for Microsoft SQL Server 7.0 and Microsoft Data Engine (MSDE) 1.0
For more information, contact your primary support provider.


For ODBC and OLE DB-based connections, ANSI_WARNINGS are set ON by default. For a DB-Library-based connection, the ANSI_WARNINGS option is set to OFF by default.

The following script demonstrates the problem:
use pubs
set ansi_warnings off

create table test(col1 int not null, col2 int not null)
insert test values(1,0)
select ISNULL(col1/col2, 0) from test
This script should return 0.


Article ID: 259775 - Last Review: February 28, 2014 - Revision: 5.0
  • Microsoft SQL Server 7.0 Service Pack 1
  • Microsoft SQL Server 7.0 Service Pack 2
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